What parameters or metrics should be investigated for diagnosing server delays if the cause is not related to CPU or traffic levels?

If server delays are not related to CPU load or traffic levels, consider investigating the following parameters:

• Disk I/O: high read/write delays on the disk can slow down request processing.
• Memory (RAM): lack of memory or frequent garbage collection (GC) can affect performance.
• Locks and thread contention: check for deadlocks, resource waiting, or synchronization issues.
• Network delays within the infrastructure: delays between services, databases, or caches.
• Database delays: slow queries, locks, missing indexes.
• Queues and asynchronous operations: accumulation of tasks in queues, processing delays.
• Logging and monitoring: analyze logs for errors and warnings.

For diagnostics, it is useful to use profiling, request tracing, latency metrics, and monitoring tools (e.g., Prometheus, Grafana, APM systems).